Water-tube boiler.



No. 742,930. PATENTBD NOV. 3, 1903. W. G. TEMPLE.

WATER TUBE BOILER.

APPLIUATION FILED MAR. 26. 1901.

no MODEL.

2 SHEETS-SHEET 1.

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G. TEMPLE. WATER TUBE BOILER.

APPLICATION FILED MAR.'26, 1901.

2 SHEETS-SHEET 2.

N0 MODEL.

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PATENT Patented November 3, 1903.

FFICE.

WILLIAM C. TEMPLE, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE AULTMAN AND TAYLOR MACHINERY COMPANY, OF MANSFIELD, OHIO,

A CORPORATION OF OHIO.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 742,930, dated November 3. 1903.

Application filed March 26,1901. Serial No. 52.922. (No model.)

To all whom, it may concern.-

Be it known that 1, WILLIAM C. TEMPLE, of Pittsburg, in the county of Allegheny and State of Pennsylvania,.have invented a new and useful Improvement in \Vater-Tube Boilers, of which the followingisa full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which to Figure l is a vertical section, and Fig. 2 is a horizontal section on the line II II of Fig. 1, of my improved boiler. Fig. 3 is a modification of the lower portion thereof.

In the drawings, 2 represents the shell or brick setting of my improved boiler. 3 is a steam and water drum at the upper portion of the setting, and 4. is a water drum at the lower part thereof. These drums are connected by a bank of tubes 5.

2o 6 is a smoke-flue which extends through the upper drum 3 and downwardly therefrom in the middle of the bank of tubes, terminating at a point above the level of the waterdrum 4. I

7 is the stack.

8 is the fire-chamber at the lower portion of the boiler-shell. This chamber may be formed at one .side only of the setting, as shown in the drawings, or there may be two or more such chambers at difierent points around the circumference of thesetting, or the chamber itself may extend entirely around the circumference, these various forms being well known in the art as equivalent constructions. The fire chamber 8, however, does not communicate directly with the lower portion of the bank of tubes; but a protecting'wall or baffle-wall 9 surrounds the lower part of the bank, so as to shield it from the 0 direct impingement of the furnace-gases and to cause said gases to ascend through the annular space 10. When the fire-chamber 8 is at one side only of the setting, I construct the boiler-setting so that the baffle-wall 9 shallbe 5 surrounded by a chamber 8', which forms an extension of the fire-chamber 8 and in which the furnace-gases circulate before they first rise through the space 10. This insures a better distribution of the gases around and among the tubes. The annular chamber 8 is of larger cross-sectional area than-the space above said chamber, and the latter space, being contracted, as the gases pass from the chambers 8 8 through the space 10 they have considerable velocity and rise within the boiler-setting toward the top of the bank of tubes; but as the draft of the stack is exerted through the dependent smoke-flue 6 upon the lower portion of the bank the gases as they cool will descend in the middle portion 00 of the bank to the mouth of the smoke-fine, whence they will rise through said flue to the stack. I have indicated by arrows in the drawings this course of the furnace gases.

The baffle-wall 9 is built, preferably, closely adjacent to and touching the outer tubes of the bank, and the water in these tubes will act as a cooling agent upon the wall, preven ing its destruction by the fire. In like manner I prefer to construct the smoke-flue 6 so that it shall touch the tubes by which it is immediately surrounded, and these tubes therefore serve to prevent it from burning. The wall 9 may be made of masonry and the smoke-flue 6 of metal.

For the purpose of more easily freeing the boiler from the dust which settles among the tubes of the bank 5 I prefer to make the lower drum 4. of annular form, having a central vertical opening 4' beneath the mouth of the flue 6. v The dust deposited from the gases instead of accumulating on "the drum 4 will tend to drop through the opening at into the pit below the drum 4, from whence it can be easily removed. This opening at, in combination with the smoke-flue 6, under which it is set, makes the cleaning of the boilertubes much easier and simpler than it otherwise would be. V

For the purpose of enabling the boiler to 0 expand and contract vertically under the influence of the heat to which it is subjected I prefer to set the drum 3 loosely within the upper part of the setting and to support the boiler at the waterdrnm 4. As theboiler- 5 tubes expand and contract the drum 3 will then move freely within the setting, and to prevent the access of air around the drum I scend to the mouth of the flue 6.

It will be understood by those skilled in' the art that the boiler above described affords many economical advantages. The combustion-chamber is large, and the gases will combine with a minimum quantity of air and will undergo perfect combustion before they begin to be cooled by striking the tubes. The best possible conditions of heating are thus afforded. Again, the hot gases tend to remain at the top of the bank of tubes, while the gases that are spent and are cooling de- A low stack temperature and a very high initial temperature of the gases thus result. The drum 3 has, preferably, a surrounding space 3', and as the hot gases from the space 10 are sent directly toward this space 3 it becomes filled with hot gases, and an efficient superheating is imparted to the steam within the drum. There need be no dead spaces at any part of the heating-s11 rface to which the gases do not gain access, nor need any baffles or deflectors be placed at inaccessible portions of the boiler. For these and other reasons the boiler constructed as above described will have high efficiency and capacity and will be very compact, requiring the least ground-space relatively to the power capable of being obtained from the boiler.

Within the scope of my invention as defined in the claims the skilled boilermaker can make many changes for the purpose of adapting my invention to different conditions under which the boiler may be used.

What I claim is- 1. A boiler having an upwardly-extending bank of tubes, a smoke-flue extending from the lower portion of the bank, a fire-chamber at the side of the boiler-setting having an annular extension around the bank of tubes into and around which the gases enter laterally from the fire-chamber, said annular extension being of greater cross-sectional area than the tube-surrounding space above, said extension entering the tube-chamber at a place exterior to the bank of tubes and at a level above the base thereof, substantially as described.

2. A boiler having an upwardly-extending bank of tubes, a smoke-flue extending from the lower portion of the bank, a fire-chamber at the side of the boiler-setting having an annular extension around the bank of tubes into and around which the gases enter laterally from the fire-chamber, a baffle-wall shielding the tubes at the ,lower portion thereof, said annular extension being of greater cross-sectional area than the tube-surrounding space above said extension and entering the tubechamber at a place exterior to the bank of tubes and at a level above the base thereof, substantially as described.

3. A boiler having an upwardly-extending bank of tubes, a smoke fine 6 extending through the upper drum downwardly in the bank of tubes to the lower portion of the bank, a baffle-wall shielding the tubes at the lower portion thereof, a combustion-chamber on the outside of said baflie-wall discharging its gases past the baffle-wall among the tubes, and having an annular extension around the battle-wall of greater cross-sectional area than the tube-surrounding space above, and an outlet for the gases extending from within the baffle-wall; substantially as described.

4. A boiler having a bank of tubes and upper steam-drum having a surrounding superheating-space, a combustion-chamber exterior tothe bank of tubes and a baflie-wall surrounding the tubes and affording an upwardly-directed opening forthe gases toward the superheating-space; substantially as described.

5. A boiler having an upwardly-extending bank of tubes, a baffle-wall shielding the tubes at the lower portion thereof and set in contact with the tubes, a combustion-chamber on the outside of the baffle-wall, discharging its gases past the baffle-wall among the tubes, and an outlet for the, gases extending from the interior of the baffle-wall at the lower portion of the boiler; substantially as described.

6. A boiler having an upwardly-extending bank of tubes, and a smoke-flue extending downwardly within the same, said smoke-flue being in contact with the tubes and being cooled thereby; substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM C. TEMPLE.

Witnesses:

CARRIE W. TEMPLE, DE BATOHELOR. 

